Electrode for electric welding-machines.



J. A! HEANY. ELECTRODE FOR ELECTRIC WELDING MACHINES.

APPLICATION FILED 0OT.7, 1912.

Patented May 13, 1913.

( surrrounded by the other. I,

' [JOHN ALLEN HEANY, or WASHINGTON, DISTRICT or COLUMBIA. w 2 iELECTRODE roe ELECTRIC wnnnme-ivmcmnns.

Specification of Letters Patent. Patehted May 13 1913 ApplicationnledOctober 7,1912. Serial N01 724,313. i

. To all whom it may concern y l Be it known that I, J oHN ALLEN HEANY,

a citizen of the United States, residing in the city of 'Washington,District of Columbia,

5 have invented certain newaand useful-Im-f provements in Electrodes forElectric Welding-Machines; and I do hereby declare the following to be afull, clear, and exact descript-ion of the invention, such as willenable lo'others skilled in the art to which it appertains to make anduse the same.

The presentinvent'on' relates to an 1m proved electrode for electricwelding, and

. more particularly spot w e'lding, which the electrodes are forcedagainst the work with considerablepressure to effect a homogeneousunion'of the metals at the weld.

- Heretofoge, it has been customary to employ electrodesmade of copperfor welding machines, but considerable, difiiculty has beenencounteredowing to the fact that the high heat generated at the weldsoftens the copper to such an extent that the ends of the electrodestend to flatten out or mushroonr 2t When pressure is applied thereto,which'un this diificulty, itis proposed to construct an electrode of theusual pencil-like form having incorporated in the body thereof a goodelectrical conductorfsuchjas copper, associat-ed with and reinforced bya metal, or

'35 other suitable material, having a high com- A pression factor .towithstand compression.

stresses-even when heated, such as steel, one :Of the elementspreferably being incased or electrode port-ion of an electric welderillus tr'ating one form of the invention. Fig. 2 is a similarviewshowing a modification.

Referring to Fig. .1 of the drawings, the

' numeral 1 indicates the-core of the electrode,

which is preferably formed of copper, of

suflicientdiameter to conduct the'welding current to and from the work.The core 1 is surroundedby a sheath orca-sing, which may be convenientlymade of steel and which is securely attached to the core, as, indicated.

The. electrodes are applied to the welding "pression factor serves totransmit the, pres-.

von theworlr to eifect a homogeneous weld.

machine in'the usual manner, one of said electrodes being movable byappropriate manually controlled means, as indicated, in order to clampthe work between the two' electrodes and to impose sufiicient presslire'Thecentra copper core affords a path of high conductivity for the heavycurrent and is brought ,into intimate contact with the surfaces of thework, while the sheathing ofsteel or other material having a high com-'sure to thework and at the sanuytime to wholly relieve. the tendency ofthe copper core to upset orflatten out. Obviously, theparticularrela,tion and arrangement of the electrode.

two elements of the electrode may be varied,

as for example; by" forming the electrode with a core of steel or thelike and an outer sheathing of copper or by embedding one or more steel,rods in the body of the copper stnucted'in accordancewith the firstmentioned modification, v.to wit, with a relatively small core 2 ofsteel'or the like and an outer .The lower electrode may be of the formheavy sheathing or casing l of copper.',80

shown. in Fig. 1. lVhen the two types of electrodeare employed,- it willbe noted that 'thepath of the current from the upper electrode to'the'lower will take theform of an inverted frustum of a cone, inasmuchas-the current will seek the shortest path fromt e copper section ofo-ne'electrode to the copper 1 In the accompanying drawings Figure 1 pis a vertical longitudinal section through the.

I pression factor.v

section of the other electrode, which wouldhave the effect ofconcentrating theheat developed bythe current to a restricted area, inthe work between the electrodes:

What I claim .is: i

1. An electrode for electric welding comprising a metal of high electricconductivity,- and a reinforcing member having a relativelyhighcompression" factor, the conducting metal and the reinforcing memberbeing so disposed as-to admit of both being brought simultaneously intointimate contact with the work. I

I 2., An electrode'for electric welding, com prising a metal of highelectricconductivity, and a reinforcing metal having a'high com 3. Anelectrode for electric'welding (geniprising concentric connectedbodiesof cop- In testimorly WhGI' BOfI affiX my signeture, per and ametal having a high compression in presence of two, Witnesses. factor. sK r v I v 4. An electrode for electric welding c0m- JOHN ALLEN HEANY' 5prising a, composite rod'of copper and steel, Witnesses:

one .of the componentv metals. being sur- FRED. B. MGLAREN,

rounded by the other. CHAS, J. ONEm

